splunk_logger: move environment hook to splunk_logger pt1

this has to be in two steps:
- duplicate to splunk_logger first
- change and use the reference from within go.mod and the main code

pkg/splunk_logger/environment_hook.go

@@ -0,0 +1,26 @@
+package logger
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+type EnvironmentHook struct {
+	Channel string
+}
+
+func (h *EnvironmentHook) Levels() []logrus.Level {
+	return []logrus.Level{
+		logrus.DebugLevel,
+		logrus.InfoLevel,
+		logrus.WarnLevel,
+		logrus.ErrorLevel,
+		logrus.FatalLevel,
+		logrus.PanicLevel,
+	}
+}
+
+func (h *EnvironmentHook) Fire(e *logrus.Entry) error {
+	e.Data["channel"] = h.Channel
+
+	return nil
+}

pkg/splunk_logger/environment_hook_test.go

@@ -0,0 +1,30 @@
+package logger
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/require"
+)
+
+func makeLogrus(buf *bytes.Buffer) *logrus.Logger {
+	return &logrus.Logger{
+		Out: buf,
+		Formatter: &logrus.TextFormatter{
+			DisableTimestamp: true,
+			DisableColors:    true,
+		},
+		Hooks: make(logrus.LevelHooks),
+		Level: logrus.DebugLevel,
+	}
+
+}
+
+func TestInfoWithEnvironment(t *testing.T) {
+	buf := &bytes.Buffer{}
+	l := makeLogrus(buf)
+	l.AddHook(&EnvironmentHook{Channel: "test_framework"})
+	l.Info("test message")
+	require.Equal(t, "level=info msg=\"test message\" channel=test_framework\n", buf.String())
+}